CHICAGO MIDWAY AP 3 SW, ILLINOIS

Monthly Total Cooling Degree Days

(111577)

Base Temperature = 65 F

File last updated on Oct 29, 2012
*** Note *** Provisional Data *** After Year/Month 201210
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1928 0.00 z 0.00 z 0.00 1.00 16.00 57.50 13.00 z 0.00 z 0.00 z 24.00 f 0.00 0.00 a 74.50
1929 0.00 0.00 0.00 b 25.50 67.00 94.82 b 8.50 z 0.00 z 0.00 z 0.00 f 0.00 0.00 187.32
1930 0.00 0.00 0.00 a 12.00 70.00 165.00 4.00 z 0.00 z 0.00 z 24.00 f 0.00 0.00 247.00
1931 0.00 0.00 0.00 0.00 a 25.50 274.66 a 25.50 z 0.00 z 0.00 z 24.00 0.50 0.00 a 324.66
1932 0.00 0.00 0.00 0.00 46.50 189.00 2.00 z 0.00 z 0.00 z 1.72 d 0.00 0.00 237.22
1933 0.00 0.00 0.00 3.50 49.50 364.50 15.00 z 0.00 z 0.00 z 1.50 g 3.00 0.00 a 420.50
1934 0.00 a 0.00 0.00 0.00 a 130.00 269.00 11.00 z 0.00 z 0.00 z 4.59 d 0.00 0.00 403.59
1935 0.00 0.00 0.00 5.00 0.50 91.00 15.00 z 0.00 z 0.00 z 9.00 g 0.00 0.00 96.50
1936 0.00 0.00 0.00 4.50 130.50 108.50 5.50 z 0.00 z 0.00 z 5.37 e 0.00 0.00 248.87
1937 0.00 0.00 0.00 0.00 53.50 127.00 3.00 z 0.00 z 0.00 z 23.52 b 0.00 0.00 a 204.02
1938 0.00 0.00 4.65 a 8.00 55.00 119.50 7.00 z 0.00 z 0.00 z 36.37 e 4.50 0.00 228.02
1939 0.00 a 0.00 1.00 10.00 93.50 254.00 7.00 z 0.00 z 0.00 z 40.62 b 0.00 0.00 399.12
1940 0.00 0.00 a 0.00 0.00 23.00 156.00 1.00 z 0.00 z 0.00 z 12.18 c 0.00 0.00 191.18
1941 0.00 0.00 0.00 22.00 105.00 201.50 18.50 z 0.00 z 0.00 z 20.31 b 0.00 a 0.00 348.81
1942 0.00 a 0.00 0.00 29.50 65.10 a 190.00 14.50 y 0.00 z 0.00 z 8.27 a 0.00 0.00 292.87
1943 0.00 0.00 a 0.00 0.00 39.50 262.00 9.00 z 0.00 z 0.00 z 9.41 c 0.00 0.00 310.91
1944 0.00 0.00 0.00 0.00 115.50 277.50 1.50 z 0.00 z 0.00 z 15.50 b 4.00 0.00 412.50
1945 0.00 0.00 0.50 8.00 14.50 115.50 9.00 z 0.00 z 0.00 z 1.50 g 1.50 0.00 140.00
1946 0.00 0.00 0.00 a 8.04 b 15.00 193.00 12.50 z 0.00 z 0.00 z 20.84 b 0.00 0.00 a 236.88
1947 0.00 0.00 0.00 0.00 7.50 123.00 11.50 z 0.00 z 0.00 z 55.05 b 0.00 0.00 185.55
1948 0.00 0.00 0.00 26.50 0.50 134.00 312.07 a 269.00 132.00 2.50 0.00 0.00 a 876.57
1949 0.00 0.00 0.00 0.00 75.00 286.00 398.50 304.00 21.00 38.00 0.00 0.00 1122.50
1950 0.00 0.00 0.00 a 0.00 a 38.00 165.00 227.00 171.00 64.00 42.00 0.00 0.00 707.00
1951 0.00 0.00 0.00 9.00 80.60 a 103.00 235.00 157.00 54.83 a 36.50 0.00 0.00 675.93
1952 0.00 0.00 0.00 9.50 32.50 289.00 383.50 246.00 105.00 7.00 2.00 0.00 1074.50
1953 0.00 a 0.00 0.00 0.00 a 69.50 276.21 a 339.40 b 338.33 b 118.93 b 50.00 0.00 0.00 a 1192.36
1954 0.00 0.00 0.00 a 10.50 36.50 353.50 355.00 256.00 154.29 b 34.50 0.00 0.00 a 1200.29
1955 0.00 0.00 a 0.00 a 5.50 70.78 a 170.00 501.17 a 424.50 131.50 10.50 0.00 0.00 1313.95
1956 0.00 0.00 0.00 5.50 79.50 313.45 a 248.50 286.00 90.52 a 29.00 0.00 0.00 c 1052.47
1957 0.00 0.00 0.00 a 16.03 a 40.50 213.62 a 353.00 261.00 68.50 0.00 0.00 0.00 952.66
1958 0.00 0.00 0.00 4.50 51.50 55.00 262.50 277.00 104.50 25.50 0.00 0.00 780.50
1959 0.00 0.00 0.00 1.50 148.80 a 248.50 304.00 423.00 185.00 6.00 0.00 0.00 1316.80
1960 0.00 0.00 0.00 31.50 29.00 135.50 268.50 330.00 194.00 18.00 0.00 0.00 1006.50
1961 0.00 0.00 0.00 0.00 31.00 172.50 280.50 294.00 205.50 23.00 2.00 0.00 1008.50
1962 0.00 0.00 0.00 32.50 184.00 206.50 221.50 301.50 92.00 41.50 0.00 0.00 1079.50
1963 0.00 0.00 0.00 10.50 29.50 278.00 312.00 240.50 131.00 79.00 0.00 0.00 1080.50
1964 0.00 0.00 0.00 10.50 117.00 268.00 334.00 225.50 132.50 0.00 0.50 0.00 1088.00
1965 0.00 0.00 0.00 0.00 78.50 152.00 239.50 191.00 101.00 15.50 0.00 0.00 777.50
1966 0.00 0.00 0.00 0.00 25.00 229.50 411.50 210.50 90.00 5.50 0.00 0.00 972.00
1967 0.00 0.00 1.00 5.50 20.50 202.00 200.50 148.50 99.00 25.50 0.00 0.00 702.50
1968 0.00 0.00 0.00 3.00 18.00 232.50 291.50 309.50 93.50 49.50 0.00 0.00 997.50
1969 0.00 0.00 0.00 0.50 83.00 122.50 310.00 320.00 103.00 33.00 0.00 0.00 972.00
1970 0.00 0.00 0.00 30.50 100.00 213.00 343.50 315.00 116.50 12.00 0.00 0.00 1130.50
1971 0.00 0.00 0.00 1.50 28.50 334.00 241.50 231.50 220.00 62.00 0.00 0.00 1119.00
1972 0.00 0.00 0.00 1.00 79.50 116.00 306.00 272.00 89.00 0.00 0.00 0.00 863.50
1973 0.00 0.00 0.00 4.50 2.00 233.00 350.00 361.50 132.50 37.50 0.00 0.00 1121.00
1974 0.00 0.00 0.00 17.50 25.00 101.00 320.50 217.50 57.00 10.00 0.00 0.00 748.50
1975 0.00 0.00 0.00 0.00 86.00 235.50 345.50 351.50 50.00 24.50 3.00 0.00 1096.00
1976 0.00 0.00 1.50 43.00 8.00 216.50 304.00 208.50 77.00 19.00 0.00 0.00 877.50
1977 0.00 0.00 0.00 37.00 240.50 194.50 417.00 218.00 77.00 0.00 1.50 0.00 1185.50
1978 0.00 0.00 0.00 0.00 88.00 156.00 242.50 260.50 207.00 0.00 0.50 0.00 954.50
1979 0.00 0.00 0.00 1.00 50.50 159.50 245.50 219.50 88.50 24.50 0.00 0.00 789.00
1980 0.00 0.00 b 0.00 i 0.00 z 56.00 j 132.00 344.88 c 288.82 a 90.00 3.50 0.00 z 0.00 859.19
1981 0.00 0.00 0.00 4.50 18.50 173.50 235.50 224.50 68.50 0.00 0.00 0.00 725.00
1982 0.00 0.00 0.00 0.00 115.00 58.00 312.00 196.00 92.50 27.50 0.00 0.00 801.00
1983 0.00 0.00 3.00 0.00 4.00 226.50 426.50 395.50 144.00 16.50 0.00 0.00 1216.00
1984 0.00 0.00 0.00 4.00 15.50 248.00 258.00 335.00 110.50 11.00 0.00 0.00 982.00
1985 0.00 0.00 0.00 52.50 69.00 136.50 301.00 200.00 168.00 3.50 0.00 0.00 930.50
1986 0.00 0.00 12.00 26.00 45.00 157.50 377.00 185.50 144.00 3.50 0.00 0.00 950.50
1987 0.00 0.00 0.00 10.50 146.50 289.50 397.00 280.00 90.50 0.00 1.00 0.00 1215.00
1988 0.00 0.00 0.00 5.50 88.00 293.50 436.50 428.50 129.50 3.00 0.00 0.00 1384.50
1989 0.00 0.00 2.50 0.50 67.50 168.50 355.50 272.00 73.50 21.50 0.00 0.00 961.50
1990 0.00 0.00 10.50 51.50 12.00 244.50 287.50 279.00 178.50 25.00 3.00 0.00 1091.50
1991 0.00 0.00 1.00 23.00 220.00 298.00 409.50 340.50 169.00 12.00 0.00 0.00 1473.00
1992 0.00 0.00 0.00 1.50 71.50 136.50 208.00 164.50 107.00 9.00 0.00 0.00 698.00
1993 0.00 0.00 0.00 1.00 49.50 171.00 352.00 327.00 34.50 6.00 0.00 0.00 941.00
1994 0.00 0.00 0.00 33.50 57.50 237.00 281.50 173.50 136.00 9.50 0.00 0.00 928.50
1995 0.00 0.00 0.00 0.00 12.00 269.00 460.50 505.00 134.00 19.50 0.00 0.00 1400.00
1996 0.00 0.00 0.00 1.00 55.00 212.00 224.50 293.50 104.50 4.00 0.00 0.00 894.50
1997 0.00 0.00 0.00 0.00 4.50 196.00 321.00 192.00 89.00 58.00 0.00 0.00 860.50
1998 0.00 0.00 9.50 0.00 121.00 232.50 347.00 330.00 180.50 8.00 0.00 0.00 1228.50
1999 0.00 0.00 0.00 2.50 93.50 273.00 505.00 242.50 116.50 7.00 1.00 0.00 1241.00
2000 0.00 0.00 4.00 0.00 90.50 178.00 259.88 a 312.50 148.00 26.00 2.00 0.00 1020.88
2001 0.00 0.00 0.00 16.50 81.00 220.00 371.00 311.00 74.00 7.00 0.00 0.00 1080.50
2002 0.00 0.00 0.00 48.50 42.50 260.50 451.00 336.50 217.50 14.00 0.00 0.00 1370.50
2003 0.00 z 0.00 0.00 9.50 8.00 118.00 269.00 340.50 98.50 9.00 0.00 0.00 852.50
2004 0.00 0.00 0.00 15.00 75.00 160.50 256.00 160.50 154.50 5.50 0.00 0.00 827.00
2005 0.00 0.00 1.00 11.50 22.00 338.00 390.00 347.00 222.00 48.50 0.00 0.00 1380.00
2006 0.00 0.00 0.00 11.00 82.50 160.00 405.50 308.50 60.00 16.50 0.00 0.00 1044.00
2007 0.00 0.00 7.75 a 5.50 108.50 244.00 287.00 325.50 181.50 70.50 0.00 0.00 1230.25
2008 0.00 0.00 0.00 0.50 12.50 211.00 316.50 262.00 115.00 18.50 0.00 0.00 936.00
2009 0.00 0.00 0.00 5.00 26.50 175.50 190.00 218.00 81.00 0.00 0.00 0.00 696.00
2010 0.00 0.00 0.00 25.00 95.00 209.00 422.00 378.00 91.50 17.50 0.00 0.00 1238.00
2011 0.00 0.00 0.00 4.00 80.50 200.00 475.50 295.50 83.50 28.00 0.00 0.00 1167.00
2012 0.00 0.00 50.50 2.50 134.00 297.50 544.00 316.00 104.50 1.00 k 0.00 z 0.00 z 1449.00
Period of Record Statistics
MEAN 0.00 0.00 1.31 9.85 63.02 201.45 328.97 280.06 116.59 19.85 0.36 0.00 1028.19
S.D. 0.00 0.00 5.88 13.12 48.29 70.79 80.95 73.94 46.82 17.90 0.93 0.00 200.50
SKEW 0.00 0.00 7.26 1.64 1.20 0.08 0.51 0.41 0.54 1.17 2.82 0.00 0.13
MAX 0.00 0.00 50.50 52.50 240.50 364.50 544.00 505.00 222.00 79.00 4.50 0.00 1473.00
MIN 0.00 0.00 0.00 0.00 0.50 55.00 190.00 148.50 21.00 0.00 0.00 0.00 675.93
NO YRS 83 84 84 84 84 85 65 65 65 78 83 84 62